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New Jersey Gov. Chris Christie recently signed into effect legislation that makes it illegal to modify any diesel vehicle, exhaust, or equipment that would increase the quantity of soot, pollution, or smoke into the air.

This in turn bans what’s known as “rolling coal,” which is when an owner bypasses the stock clean air restrictors allowing the vehicle to eject black smoke when revving the engine or accelerating.

As NJ.com points out though, this bill might redundant to the already in place State Department of Environmental Regulations law, which says that “vehicles ‘shall not emit visible smoke, whether from crankcase emissions or from tailpipe exhaust, for a period in excess of three consecutive seconds.”

Thus, notes em>Automobile, the U.S. Environmental Protection Agency has always said rolling coal is illegal and federal law disallows modifying diesels in way that would increase pollution.